Abstract

This study aimed at determining the depth profile and effects of domestic and economic activities on the accumulation of nutrients and trace metals in Awoye Estuary. Bathymetry profile along an approximately twenty-kilometre profile reveals a shallow water estuary, while its physico-chemical properties are greatly influenced by the influx of seawater, with chloride and sodium being the dominant ions. Low concentrations of calcium and potassium ion were observed across the estuary due to their preferential absorption with magnessium and sodium ion respectively. Nutrients concentrations such as phosphate and sulphate were present in relatively high amounts which can be hazardous to marine lives in the estuary, thus requiring urgent control. Results of trace metals in sediments show that concentrations of Pb, Zn, Cu, Cr and Ni are reflective of their inputs; with concentrations of Pb, Cu and Zn being higher at areas where there is high human population, oil exploration and economic activities. Generally, the estuary has fairly good water quality for the survival of marine lives. Sediments quality, however, needs to be closely monitored for ecological and public health risks associated with anthropogenic activities in the area.